Altronics A 2451 Bedienungsanleitung
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174 Roe Street, PERTH.
Western Australia. 6000
Phone: (08) 9428 2188
Fax: (08) 9428 2187
Internet: www.altronics.com.au
Dealers Throughout Australia
120W Active
Subwoofer Module
A subwoofer can add a new dimension to your
listening pleasure. The inclusion of a sub-woofer will
enhance any existing sound system and add a touch
of realism to any home theatre system.
A 2451
Explanation of controls on the A 2451
Phase Switch
If the subwoofer has been wired out of phase this will exhibit itself as a “hole”
in the signal. The phase switch can correct this problem. To correct the prob-
lem set switch to 180° . If there is no “hole” in the signal leave the phase
switch set to 0°
Crossover frequency.
The crossover frequency control is used to tune the subwoofer amplifier module
to the frequency of the enclosure design. Some speakers have a very narrow
operating range, while others can operate over a wider range. The frequency
control acts like a tuneable crossover.
Volume
The volume control is used to adjust the volume of the sub-woofer to match the
rest of the system.
Wiring the Sub-woofer into the amplifier
The only wiring required is connection to the subwoofer speaker. See Figure 1.
ON / OFF switch
The unit features an auto power up and auto power down. When switched on
and in standby mode the power indicator will illuminate red. When a signal is
present the power indicator will turn green to indicate the subwoofer is on. At a
given input signal level (factory set) the subwoofer will switch on. When the
input signal has been turned off, or the input source volume is set to a very low
setting, the subwoofer will auto power off after about 10 minutes. When the
input signal is again restored the unit will again auto power up.
Troubleshooting hum noise (Figure 2)
If a hum exists in your subwoofer after connection to your system we suggest
that the mains power is connected to the same mains power outlet as the
amplifier and input sources.
If this is not possible we suggest a ground loop isolator such as an Altronics C
9555 is inserted in the signal line (ie RCA inputs) between the main amplifier
and the subwoofer unit.
Specifications
Maximum power output: ..........................................................180W
RMS power output (0.1% THD): ................................................120W
Input impedance ................................................................50k ohm
Amplifier frequency response ............................................20-200Hz
Input sensitivity – RCA’s ........................................................160mV
Input sensitivity - binding posts..................................................3.2V
Speaker size ........................................................................200mm
SPL ........................................................................87dB @ 1W, 1m
Black
Wire
Red
Wire
Figure 1 : A side view of the amplifier module. Use this diagram to
wire the speaker to the amplifier module .
Heatsink
Sub-woofer
To 240V
AC outlet
WARNING
There are no user serviceable parts inside the unit. Do not open the unit. If the fuse blows, only replace with an equivalent 1.6A
fast blow fuse.
Figure 2 : In the event of hum in your signal, insert a ground loop isolator
between the subwoofer and the amplifier.
Altronics A 2451 Active subwoofer module
L
R
L
R
In Out
Auxiliary Output/Subwoofer Output
Hi-Fi Amplifier
High Level Out High Level In
R+
R-
L+
L-
R+
R-
L+
L-
Fuse 1.6A 250V
Subwoofer Rear Panel Module
Level
Crossover
Phase
On/Off/Auto
L
R
L
R
In Out
Speaker Outputs
Hi-Fi Amplifier
High Level Out High Level In
R+
R-
L+
L-
R+
R-
L+
L-
Fuse 1.6A 250V
Subwoofer Rear Panel Module
+
+
Front Speaker Left
Front Speaker Right
Level
Crossover
Phase
On/Off/Auto
Fig 3: Connection of the A 2451 via low level or RCA inputs. NOTE: The high level
outputs will not produce any output in this configuration.
Fig 4: Connection of the A 2451 via high level or speaker inputs.
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